Policemen investigate the site of a car bomb attack on the convoy of Egyptian public prosecutor Hisham Barakat near his house at Heliopolis district in Cairo, Egypt, June 29, 2015. Barakat was injured when a car bomb struck his convoy as it was leaving his home in Cairo on Monday, in a high-profile attack against the judiciary, security and judicial sources said. REUTERS/Mohamed Abd El Ghany 

Policemen secure the site of a car bomb attack on the convoy of Egyptian public prosecutor Hisham Barakat near his house at Heliopolis district in Cairo, Egypt, June 29, 2015. Barakat died from wounds sustained in a bomb attack on Monday that had targeted his convoy in Cairo, state news agency MENA said. REUTERS/Mohamed Abd El Ghany 

Crime scene investigators investigate the site of a car bomb attack on the convoy of Egyptian public prosecutor Hisham Barakat near his house at Heliopolis district in Cairo, Egypt, June 29, 2015. Barakat was injured when a car bomb struck his convoy as it was leaving his home in Cairo on Monday, in a high-profile attack against the judiciary, security and judicial sources said. REUTERS/Mohamed Abd El Ghany 

A view shows burnt cars at the site of a car bomb attacked the convoy of Egyptian public prosecutor Hisham Barakat near his house at Heliopolis district in Cairo, Egypt, June 29, 2015. Barakat was injured when a car bomb struck his convoy as it was leaving his home in Cairo on Monday, in a high-profile attack against the judiciary, security and judicial sources said. REUTERS/Mohamed Abd El Ghany 

A man moves his damaged car away from the site of a car bomb attack on the convoy of Egyptian public prosecutor Hisham Barakat near his house at Heliopolis district in Cairo, Egypt, June 29, 2015. Barakat was injured when a car bomb struck his convoy as it was leaving his home in Cairo on Monday, in a high-profile attack against the judiciary, security and judicial sources said. REUTERS/Mohamed Abd El Ghany 

A crime scene investigator investigates the site of a car bomb attack on the convoy of Egyptian public prosecutor Hisham Barakat near his house at Heliopolis district in Cairo, June 29, 2015. Barakat died from wounds sustained in a bomb attack on Monday that had targeted his convoy in Cairo, state news agency MENA said. REUTERS/Mohamed Abd El Ghany 

Residents look at the site of a car bomb attack on the convoy of Egyptian public prosecutor Hisham Barakat near his house at Heliopolis district in Cairo, Egypt, June 29, 2015. Barakat was injured when a car bomb struck his convoy as it was leaving his home in Cairo on Monday, in a high-profile attack against the judiciary, security and judicial sources said. REUTERS/Mohamed Abd El Ghany 

A car damaged as a result of a car bomb attack on the convoy of Egyptian public prosecutor Hisham Barakat near his house at Heliopolis district is seen in Cairo June 29, 2015. Barakat died from wounds sustained in a bomb attack on Monday that had targeted his convoy in Cairo, state news agency MENA said. REUTERS/Mohamed Abd El Ghany 

A nearby apartment damaged as a result of a car bomb attack on the convoy of Egyptian public prosecutor Hisham Barakat, near his house at Heliopolis district in Cairo, June 29, 2015. Barakat died from wounds sustained in a bomb attack on Monday that had targeted his convoy in Cairo, state news agency MENA said. REUTERS/Mohamed Abd El Ghany 

A car damaged as a result of a car bomb attack on the convoy of Egyptian public prosecutor Hisham Barakat near his house at Heliopolis district, is seen in Cairo, June 29, 2015. Barakat died from wounds sustained in a bomb attack on Monday that had targeted his convoy in Cairo, state news agency MENA said. REUTERS/Mohamed Abd El Ghany